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Order: Pristiophoriformes Family: Pristiophoridae (Sawsharks). Etymology: Greek, pristis= “saw”. Pliotrema P. warreni (Sixgill sawshark). Pristiophorus P. Cirratus (Longnose shark) P. japonicus (Japanese sawshark) P. nudipinnis (Shortnose sawshark)

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order pristiophoriformes family pristiophoridae sawsharks

Order: PristiophoriformesFamily: Pristiophoridae (Sawsharks)

Etymology: Greek, pristis= “saw”

taxonomy
Pliotrema

P. warreni

(Sixgill sawshark)

Pristiophorus

P. Cirratus (Longnose shark)

P. japonicus (Japanese sawshark)

P. nudipinnis (Shortnose sawshark)

P. schroderi (Bahamas sawshark)

4 undescribed species

Taxonomy

2 genera, 5 species

general characteristics
5-6 gill slits

Large spiracles behind eyes

2 large dorsal fins (no spines)

Somewhat long dorsal lobe on caudal fin (no ventral lobe)

General Characteristics
general characteristics4
Small sharks, <2 m

Benthic/benthopelagic, up to & > 366 m

Sawlike snout=rostrum

Rostral barbels on ventral side of snout

Teeth replaced (unlike sawfish) when lost, alternate sizes

General Characteristics
sawfish
Sawfish
  • Superorder: Batoidea
  • Order: Pristiformes
  • Family: Pristidae
    • Much larger maximum size
    • No barbels
    • Evenly sized teeth
    • Gill slits on undersurface
diagnostic features ususa y distinguished by teeth count
Diagnostic Featuresususa;;y distinguished by teeth count
  • Pliotrema warreni- Sixgill sawshark
    • 6 pairs of gill openings
    • Found in W. Indian Ocean (SE coast of S. Africa)
slide7
Pristiophorus cirratus- Longnose sawshark
    • 9-10 teeth in front of barbels, 9 behind
    • 1st dorsal origin behind rear tips of pectorals
    • Found in W. Pacific (Australia, Philippines?)
slide8
Pristiophorus japonicus- Japanese sawshark
    • 15-26 teeth in front of barbels, 9-17+ behind
    • 1st dorsal origin behind rear tip of pectorals
    • Found in W. Pacific
slide9
Pristiophorus nudipinnis- Shortnose sawshark
    • 13 teeth in front of barbels, 6 behind
    • 1st dorsal opposite free rear tips of pectorals
    • Found in S. Pacific (southern shelf of Australia)
slide10
Pristiophorus schroederi- Bahamas sawshark
    • 13-14 teeth in front of barbels, 9-10 behind
    • 1st dorsal opposite free rear tips of pectorals
    • Found in W. Atlantic (region btwn. Cuba, FL, and Bahamas)
reproduction life span
Reproduction/Life Span
  • Ovoviviparous- 7-17 pups (average of 10)
  • Gestation ~ 12 months
  • Reach maturity ~ 2 years
  • Parents provide food and protection during post-birth (duration unknown, 1.5 years?)
  • Breed seasonally, every two years
  • Have been known to live up to 15 years in wild
habitat food habits
Habitat/Food Habits
  • 640-950 m in and around cont’l & insular shelves & upper slopes
  • Feed on , shrimp, squids, & crustaceans
  • Cruise along bottom using barbels & ampullae of Lorenzini on saw to detect prey in mud or sand
  • Attack prey w/ side to side swipes of the saw
commercial value predators
Commercial Value/Predators
  • Longnose sawshark and Shortnose sawshark caught commercially off Australia
  • Japanese sawfish highly valued for making “kamaboko”- tradional Japanese fishcake
  • Humans are main predator (trawl fishing), also larger sharks
bibliography
Bibliography
  • Carrier, J.C., et. al. 2004. Biology of Sharks and Their Relatives. CRC Press, Boca Raton, FL. p. 55
  • Castro, J.I. 1983. The sharks of North American waters. Texas A&M University Press, College Station, TX. pp.35-36.
  • Compagno, L.J. 1984. FAO species catalogue. Vol. 4. Sharks of the World. An annotated and illustrated catalogue of shark species known to date. Part 1- Hexanchiformes to Lamniformes. FAO Fish. Synop. 125(4/1): 1-249.
  • Krcmaric, D. and K. Francl. 2006. "Pristiophorus cirratus" (On-line), Animal Diversity Web. Accessed September 16, 2007 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Pristiophorus_cirratus.html.
  • Martin, R. Aidan.  2003.  Copyright and Usage Policy.  World Wide Web Publication,
  • Retrieved September 16th, 2007 from: http://www.elasmo-research.org/education/shark_profiles/pristiophoriformes.htm.
  • Slaughter, B. & Springer, S. 1968. Replacement of Rostral Teeth in Sawfishes and
  • Sawsharks. Copeia Vol 1968 (#3- 8/3)1. pp:499-506.